CN104807706A - Portable weak-layer in-situ direct-shear tester and testing method thereof - Google Patents

Portable weak-layer in-situ direct-shear tester and testing method thereof Download PDF

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Publication number
CN104807706A
CN104807706A CN201510202693.7A CN201510202693A CN104807706A CN 104807706 A CN104807706 A CN 104807706A CN 201510202693 A CN201510202693 A CN 201510202693A CN 104807706 A CN104807706 A CN 104807706A
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counter
force
weak
shear
situ
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张勇
魏玉峰
程英建
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PROSPECTING TECHNOLOGY INST CHINESE ACADEMY OF GEOLOGICAL SCIENCES
Chengdu Univeristy of Technology
Institute of Exploration Technology Chinese Academy of Geological Sciences
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PROSPECTING TECHNOLOGY INST CHINESE ACADEMY OF GEOLOGICAL SCIENCES
Chengdu Univeristy of Technology
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Priority to CN201510202693.7A priority Critical patent/CN104807706A/en
Publication of CN104807706A publication Critical patent/CN104807706A/en
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Abstract

The invention provides a portable weak-layer in-situ direct-shear tester and a testing method thereof. The portable weak-layer in-situ direct-shear tester comprises a counter-force steel frame, a shear box, a horizontal loading system and a vertical loading system, wherein a test space is formed in the counter-force steel frame; the shear box is mounted in the test space; one end of the horizontal loading system acts on the counter-force steel frame, and the other end of the horizontal loading system acts on the vertical lateral wall of the shear box; the vertical loading system comprises a row of balls, one end of the vertical loading system acts on the top cover of the counter-force steel frame, and the other end of the vertical loading system acts on the upper surface of the shear box through the balls. Through the adoption of the portable weak-layer in-situ direct-shear tester disclosed by the invention, the shear parameters of unperturbed weak layers in situ can be quickly obtained on site, so that the tested result is more accurate and reliable, and the tester is convenient to test the shear strength parameters of weak layers in situ; in addition, the portable weak-layer in-situ direct-shear tester disclosed by the invention also has the characteristics of being simple in structure, easy to operate and portable.

Description

Potable weak and soft layer band in-situ direct shear test instrument and method of testing thereof
Technical field
The invention belongs to rock mechanical parameter field tests, particularly a kind of potable weak and soft layer band in-situ direct shear test instrument and method of testing thereof.
Background technology
Weak intercalations is the rock stratum in zonal arrangement that in rock mass, physico-mechanical properties is more weak relative to country rock, contains weak intercalated layer, fault belt, fault zone etc.In water power, railway, highway large-scale construction project, usually run into weak intercalations and the Geological Hazard such as slope instability, Tunnel Landslide caused, be the controlling boundary condition of engineering rock mass stability, be also one of key factor of engineering construction cost control simultaneously.Therefore, weak intercalations is the emphasis of all kinds of large-scale Geological Engineering research, and the intensive parameter of weak intercalations is the key mechanics parameter controlling Rock And Soil and upper part work buildings Against Sliding Stability.
Current acquisition weak intercalations " original state " sample is everlasting to explore in adit and is carried out.Normally obtain with sleeve at the scene, then with lifting jack, sample is pressed in shear box, or adopt artificial iron pick to sample.After excavation, by digging mode with off-load is loose affects, the sample of acquisition, very easily by disturbance, can not reflect the virtual condition of on-the-spot weak intercalations completely.Test in situ can measure intact weak intercalations intensive parameter relative to shop experiment, and sampling process can be avoided the disturbance of sample, and test value is more accurate, close to actual.
Direct shear apparatus develops based on classical rock-soil mechanics Coulomb block effect, the earliest and the most directly measure the major technique equipment of Rock And Soil and weak structural face shearing strength thereof and means of testing, test principle is basically identical, but instrument and equipment and research technique exist larger difference, especially in version and using method, there is bigger difference.
Most direct shear apparatus loading system selects fluid pressure type; Frame mainly comprises cased beam integral frame-type, column cased beam combined type etc.; Measuring system mainly contains mechanical type, sensor digital display type, computer automatic analysis collection etc.The on-the-spot test of weak intercalations intensive parameter, the testing equipment usually adopted is in-situ large scale shear test device, and it is higher to test site conditional request, and in addition, instrument is heavy, test length consuming time, limits the practical application effect of this kind equipment to a great extent.
Application number is the large-scale direct shear test equipment in a kind of coarse-grained soil scene that application discloses of CN2014101201243.This invention belongs to rock-soil mechanics site test parametric measurement technical field, relates to the on-the-spot large-scale direct shear test equipment of a kind of coarse-grained soil.This on-the-spot large-sized experiment equipment comprises counterforce device, vertical loading system, horizontal addload system, test macro, shear box.Adopt machine excavation with hand excavation, repair the mode combined, prepare wedge shape knoll (earthen platform) of undisturbed required size, counter-force is provided from load by country rock, and the stress-type quick shear test under adopting bulb flat stacking to carry out the natural aqueous state of on-the-spot coarse-grained soil.But this invention belongs to Large Shear testing equipment, equipment is heavy, carry inconvenience, and experimentation cost is higher, requires also higher, be not easy to carry out test in situ in a large number to work-yard.And required counter-force is comparatively large, required country rock is higher from load, and reaction beam is not easily installed.
Application number is that the application for a patent for invention of CN200710025380.4 discloses a kind of portable field and indoor dual-purpose direct shear test instrument and sampling and testing method thereof.This test instrument comprises sampling equipment, system is cut in mobile vertical loading system and horizontal stretch-draw, rigid frame and cross cutting box are together imbedded in the on-the-spot soil body of needs test, again the soil body entirety comprising rigid frame and cutting box is dug out, obtain the globality sample that disturbance is less, acquired globality sample is put in the rigid frame base be fixed on boxed frame, vertical force is applied by the vertical loading system of movable type be arranged on boxed frame, adopt the intensity of the stretch-draw cutting box test soil body, the volume change of sample vertical direction can not be limited in process of the test.This method of testing will be cut mode and be changed into flexible stretching mode by rigidity pushing tow, overcome rigid contact shear box friction problem, and in process of the test, pressure at right angle can not be eccentric to adopt portable press perpendicular system to guarantee, thus improve measuring accuracy.But this invention needs sample entirety to dig out, and does not belong to in-situ test; And flexible stretching mode pulling force is less, level easily by disturbance eccentric force, is difficult to the accuracy requirement meeting weak intercalations strength test to pulling force.
Visible, also lack quick, economic, portable weak intercalations in-situ direct shear test equipment at present, therefore weak intercalations in-situ test is mostly limited to prospecting cost and drops in larger large-scale, mega-construction project, and numerous engineering constructions mainly still relies on shop experiment parameter and designer's experience to obtain intensive parameter, lack the support of test in situ data, be difficult to the needs meeting modern construction.
Summary of the invention
The object of the invention is to, there is provided a kind of potable weak and soft layer band in-situ direct shear test instrument and method of testing thereof, to solve in prior art, the conventional general quality of original position direct shear apparatus is large, experimentation cost is high, entirety is non-dismountable, inconvenient technical matters is carried in transport.
A first aspect of the present invention provides a kind of potable weak and soft layer band in-situ direct shear test instrument, comprising: counter-force steelframe, and counter-force steelframe inside forms the test space; Shear box, is arranged in the test space; Horizontal addload system, one end acts on counter-force steelframe, and the other end acts in the vertical side walls of shear box; Vertical loading system, comprise ball row, one end of vertical loading system acts on the top cover of counter-force steelframe, and the other end acts on the upper surface of shear box by ball row.
Preferably, between the other end of horizontal addload system and shear box, be provided with the first bearing plate being with groove, between the other end of vertical loading system and shear box, be provided with the second bearing plate being with groove.
Preferably, vertical loading system also comprises upper cover and dividing plate, and upper cover, ball row and dividing plate from top to bottom set gradually.
Preferably, square shear box inside is formed for placing cutting ring and the cylindrical space identical with the external diameter of cutting ring.
Preferably, potable weak and soft layer band in-situ direct shear test instrument also comprises porous-stone and filter paper, and porous-stone and filter paper are arranged between dividing plate and the upper surface of shear box.
Preferably, potable weak and soft layer band in-situ direct shear test instrument also comprises the sensor for measuring dividing plate and shear box displacement, and sensor is connected with computer data acquisition system.
Preferably, counter-force steelframe is four post two-plate counter-force steelframes, the top cover of four post two-plate counter-force steelframes is welded with girt strip, and the both sides corresponding with horizontal addload system of four post two-plate counter-force steelframes are steel plate, and all the other both sides of four post two-plate counter-force steelframes are in open state.
Preferably, counter-force steelframe also comprises the counter-force seat for being fixedly connected with rocky ground, and the lower end of each column of four post two-plate counter-force steelframes is all provided with a counter-force seat.
Preferably, counter-force seat is fixed on rocky ground by expansion bolt.
Present invention also offers a kind of method of testing of above-mentioned potable weak and soft layer band in-situ direct shear test instrument, it is characterized in that, comprise: step 1, select to need the weak intercalations exposure position of carrying out test, throw off the top covering rockmass of the weak intercalations of preset range, be positioned on weak intercalations by smooth for the cutting ring of potable weak and soft layer band in-situ direct shear test instrument, then cutting ring is pressed down to form cylindric sample in situ, and the soil body of sample in situ periphery is removed, reserved shear test seam, is then enclosed within the outside of cutting ring by shear box; Step 2, utilizes level to ensure place level, utilizes ruler to measure and adjusts the position of counter-force steelframe, shear box and vertical loading system being located along the same line, and in shear box, putting into porous-stone and filter paper; Step 3, start-up simulation machine data acquisition system also returns to zero, and then starts horizontal addload system and vertical loading system, and adopts fine motion form alternately to make the workplace of horizontal addload system and vertical loading system and shear box be adjacent to; Step 4, flat stacking is adopted to carry out quick shear test: to apply vertical pressure by vertical loading system, and apply level to shearing force to catch peak value by horizontal addload system level, sample in situ is made to cut damage in 3 to 5min, the loading of horizontal addload system is stopped after detrusion reaches predetermined value, complete one group of test, and by computer data acquisition system whole process record stress-strain data; Step 5, unloads horizontal addload system and vertical loading system successively, takes out shear box, levers up the expansion bolt on the counter-force seat of counter-force steelframe, and counter-force steelframe is loosened to be taken out by counter-force steelframe.
The weak intercalations shear strength parameter that the present invention is undisturbed under on-the-spotly can testing in-situ condition fast, result is more accurate, reliable.In addition, the present invention also have structural shape succinct, be easy to operation, portable feature.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is vertical view of the present invention;
Fig. 3 is the structural representation of the top cover of counter-force steelframe;
Fig. 4 is the structural representation of shear box;
Fig. 5 is sample in situ sample making course schematic diagram.
Reference numeral in figure: 1, counter-force steelframe; 2, shear box; 3, horizontal addload system; 4, vertical loading system; 5, ball row; 6, the first bearing plate; 7, the second bearing plate; 8, dividing plate; 9, cutting ring; 11, girt strip; 12, weak intercalations; 13, force-transmitting pole; 14, absorb water filter house; 15, upper cover; 16, expansion bolt; 17, rocky ground; 18, the 3rd bearing plate; 19, the 4th bearing plate; 21, leave a blank; 22, steel plate; 23, sensor; 24, shear surface.
Embodiment
Ultimate principle of the present invention proposes, according to Coulomb strength criterion based on classical rock-soil mechanics coulomb principle wherein, τ frefer to the shearing strength (kPa) of Rock And Soil, σ is the normal pressure (kPa) acted on shear surface, refer to the angle of internal friction (°) of Rock And Soil, c refers to the cohesion (kPa) of Rock And Soil, by with shearing strength τ ffor ordinate, pressure at right angle σ is horizontal ordinate, draws shearing strength τ fwith the relation curve of pressure at right angle σ, paint according to the upper each point of figure the straight line that looks survey, the inclination angle of straight line is the angle of internal friction of soil the intercept of straight line on axis of ordinates is the cohesive strength c of soil.In the vertical direction of the present invention applies a constant load, and applies horizontal applied force, when there is the relative changing of the relative positions in shear box, sample shear damage (in this test general displacement be greater than 4mm be considered as sample destruction), now namely the shearing of sample is soil classifiction τ f.
Please refer to Fig. 1 to Fig. 5, the invention provides a kind of potable weak and soft layer band in-situ direct shear test instrument, comprising: counter-force steelframe 1, counter-force steelframe 1 inside forms the test space; Shear box 2, is arranged in the test space; Horizontal addload system 3, one end acts on counter-force steelframe 1, and the other end acts in the vertical side walls of shear box 2; Vertical loading system 4, comprise ball row 5, one end of vertical loading system 4 acts on the top cover of counter-force steelframe 1, and the other end acts on the upper surface of shear box 2 by ball row 5.Such as, horizontal addload system 3 and vertical loading system 4 all can utilize hydraulic jack to realize, and obviously, also can adopt other forms of loading system.
Preferably, the upper end of vertical loading system 4 is acted on the top cover of counter-force steelframe 1 by force-transmitting pole 13.Sample in situ in shear box 2 can be made when shearing by ball row 5, sample produces displacement by level to shearing force, meanwhile, can also make vertical loading system 4 in test process, apply vertical acting force all the time to sample in situ.
Potable weak and soft layer band in-situ direct shear test instrument in the present invention is Whole-dismountable, during use, by counter-force steelframe 1, shear box 2, horizontal addload system 3 and vertical loading system 4 etc. assemble at the scene, counter-force steelframe 1 is utilized to provide counter-force to support for horizontal addload system 3 and vertical loading system 4, like this, the shearing force of test can be applied to the sample in situ in shear box 2 by horizontal addload system 3, and apply vertical power by vertical loading system 4 to sample in situ, with the quasiprimitive vertical stress of mould, sample in situ is made more to press close to original stress, thus, the weak intercalations parameters of shear resistant that the present invention is undisturbed under on-the-spotly can testing in-situ condition fast, result is more accurate, reliably.In addition, the present invention also have structural shape succinct, be easy to operation, portable feature.
Preferably, between the described other end of horizontal addload system 3 and shear box 2, be provided with the first bearing plate 6 being with groove, between the described other end of vertical loading system 4 and shear box 2, be provided with the second bearing plate 7 being with groove.Preferably, between described one end of horizontal addload system 3 and counter-force steelframe 1, be provided with the 3rd bearing plate 18, between described one end of vertical loading system 4 and counter-force steelframe 1, be provided with the 4th bearing plate 19.
Preferably, vertical loading system 4 also comprises upper cover 15 and dividing plate 8, and upper cover 15, ball row 5 and dividing plate 8 from top to bottom set gradually.In shear history, sample in situ obtains by ball row 5 acting force applied from vertical loading system 4 all the time, meanwhile, under the effect that dividing plate 8 arrange at ball, moves, thus can not hinder sample in situ moving horizontally when shearing along horizontal aspect.
Preferably, square shear box 2 inside is formed for placing cutting ring 9 and the cylindrical space identical with the external diameter of cutting ring 9.Preferably, square shear box 2 is the steel construction adopting die casting square-outside and round-inside, and its outside height about 3.0cm, length and width is 10cm, and the diameter of cylindrical space is 6.5cm.Preferably, cutting ring 9 can select Sampling Area 30cm 2cutting ring, internal diameter size is 61.8mm, and external diameter is 65mm, thick about 0.3mm, blade angle 10 °.
Preferably, potable weak and soft layer band in-situ direct shear test instrument also comprises porous-stone and filter paper, and porous-stone and filter paper are arranged between the upper surface of dividing plate 8 and shear box 2.Wherein, in Fig. 1 and Fig. 4, porous-stone and filter paper form water suction filter house 14 altogether.
Preferably, potable weak and soft layer band in-situ direct shear test instrument also comprises the sensor 23 for measuring dividing plate 8 and shear box 2 displacement, and sensor 23 is connected with computer data acquisition system.More preferably, sensor 23 is installed in the first bearing plate 6 or the second bearing plate 7.Preferably, before test, must normally run the friction force of generation to vertical and horizontal addload system test and assembly gravity is demarcated, to deduct when achievement arranges, make test result more accurate.
Preferably, counter-force steelframe 1 is four post two-plate counter-force steelframes, the top cover of four post two-plate counter-force steelframes is welded with girt strip 11, and the both sides corresponding with horizontal addload system 3 of four post two-plate counter-force steelframes are steel plate, and all the other both sides of four post two-plate counter-force steelframes are in open state.Preferably, the thick about 20mm of both sides steel plate.Like this, test observation, handling and adjustment is convenient to.In a preferred embodiment, four post two-plate counter-force steelframes select thick about 20mm standard steel plate to cut into 3 block plates 22, fix along long limit steel screw between two, and at four post two-plate counter-force steelframe top cover welding girt strips to increase the rigidity of structure, both sides corresponding with horizontal addload system 3, bottom are steel plate, both sides are formed and leave a blank 21, so that test observation, handling and adjustment in addition.
Preferably, counter-force steelframe 1 also comprises the counter-force seat for being fixedly connected with rocky ground, and the lower end of each column of four post two-plate counter-force steelframes is all provided with a counter-force seat.Preferably, counter-force seat is fixed on rocky ground 17 by expansion bolt 16.Like this, in being rigidly connected between counter-force steelframe 1 and rocky ground, to make counter-force steelframe 1 firmly and enough vertical and level can be provided to counter-force.Preferably, counter-force seat is formed with fixed orifice, its aperture is 11mm, and itself and rocky ground lock by available general 10mm expansion bolt, in being rigidly connected, to make test steel frame construction firmly and enough vertical and level can be provided to counter-force.
Present invention also offers a kind of method of testing of this potable weak and soft layer band in-situ direct shear test instrument, comprising:
Step 1, select to need the weak intercalations 12 exposure position of carrying out test, throw off the top covering rockmass of the weak intercalations 12 of preset range (such as, can hand excavation, finishing mode remove top covering rockmass, and carry out smooth to weak intercalations 12), be positioned on weak intercalations 12 by smooth for the cutting ring 9 of potable weak and soft layer band in-situ direct shear test instrument, then cutting ring 9 is pressed down to form cylindric sample in situ, and the soil body of sample in situ periphery is removed, reserved shear test seam (about 2 ~ 3mm), is then enclosed within the outside of cutting ring 9 by shear box 2;
Step 2, utilizes level to ensure place level, utilizes ruler to measure and adjusts the position of counter-force steelframe 1, shear box 2 and vertical loading system 4 being located along the same line, and putting into porous-stone and filter paper in shear box 2;
Step 3, start-up simulation machine data acquisition system also returns to zero, and then starts horizontal addload system 3 and vertical loading system 4, and adopts fine motion form alternately to make the workplace of horizontal addload system 3 and vertical loading system 4 and shear box 2 be adjacent to;
Step 4, flat stacking is adopted to carry out quick shear test: to apply vertical pressure by vertical loading system 4, and apply level to shearing force to catch peak value by horizontal addload system 3 classification, sample in situ is made to cut damage in 3 to 5min, the loading of horizontal addload system 3 is stopped after detrusion reaches predetermined value (such as 6mm), complete one group of test, and by computer data acquisition system whole process record stress-strain data; Now, shear surface 24 is formed on the bottom of sample in situ.
Step 5, unloads horizontal addload system 3 and vertical loading system 4 successively, takes out shear box 2, levers up the expansion bolt on the counter-force seat of counter-force steelframe 1, and counter-force steelframe 1 is loosened to be taken out by counter-force steelframe 1.
Above operation repeatedly, carry out being no less than four groups of tests and arrange for test figure achievement, and by following data preparation method, data are processed:
Normal stress σ on shear surface, shear stress τ are calculated as follows,
σ = G | P f 1 A
τ = F - f 2 A
Wherein: G is the gravity of vertical oil cylinder, shear test box; P is that vertical sensor records force value; f 1for the friction force (test is demarcated before carrying out and recorded) that vertical system produces; f 2for the friction force (test is demarcated before carrying out and recorded) that level produces to system; F is horizontal loading forces (sensor measurement payload values), and A is shear surface area.
In sum, the present invention is when testing, adopt hand excavation, the mode of finishing, by in cutting ring 9 entirety press-in weak intercalations, thus undisturbed cylindric sample in situ can be prepared, and adopt horizontal addload system 3 and vertical loading system 4 (such as, the two can be small-sized oil cylinder) implement flat stacking, to carry out quick shear test under the natural aqueous state of on-the-spot original position, there is structural shape succinct, be easy to operation, portable feature, on-the-spot test can obtain weak intercalations parameters of shear resistant undisturbed under in-situ condition, result is more accurate, reliably.
The natural direct shear test of weak intercalations original position completed by the embodiment of the present invention can be obtained reliably, closer to real test figure.In addition, the present invention also has Whole-dismountable, sample cut the features such as constant, usable range is wide.When conditions permit, water soaking of manually can satisfying in testing pits, carries out the full water fast direct scissor test of weak intercalations.
Compared with prior art, the invention has the beneficial effects as follows: (1) equipment set structure is simple, and easy to operate, a whole set of instrument can load in a box frame, and volume is little, is easy to carry and safeguards; (2) truly can be reflected the virtual condition of on-the-spot weak intercalations by in-situ test, test value more presses close to field condition; (3) less demanding to test site, decrease excavated volume, greatly reduce experimentation cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a potable weak and soft layer band in-situ direct shear test instrument, is characterized in that, comprising:
Counter-force steelframe (1), described counter-force steelframe (1) inside forms the test space;
Shear box (2), is arranged in the described test space;
Horizontal addload system (3), one end acts on described counter-force steelframe (1), and the other end acts in the vertical side walls of described shear box (2);
Vertical loading system (4), comprise ball row (5), one end of described vertical loading system (4) acts on the top cover of described counter-force steelframe (1), and the other end acts on the upper surface of described shear box (2) by described ball row (5).
2. potable weak and soft layer band in-situ direct shear test instrument according to claim 1, it is characterized in that, be provided with the first bearing plate (6) being with groove between the described other end of described horizontal addload system (3) and described shear box (2), between the described other end of described vertical loading system (4) and described shear box (2), be provided with the second bearing plate (7) being with groove.
3. potable weak and soft layer band in-situ direct shear test instrument according to claim 1, it is characterized in that, described vertical loading system (4) also comprises upper cover (15) and dividing plate (8), and described upper cover (15), described ball row (5) and described dividing plate (8) from top to bottom set gradually.
4. potable weak and soft layer band in-situ direct shear test instrument according to claim 1, it is characterized in that, square described shear box (2) inside is formed for placing cutting ring (9) and the cylindrical space identical with the external diameter of described cutting ring (9).
5. potable weak and soft layer band in-situ direct shear test instrument according to claim 3, it is characterized in that, described potable weak and soft layer band in-situ direct shear test instrument also comprises porous-stone and filter paper, and described porous-stone and filter paper are arranged between the upper surface of described dividing plate (8) and described shear box (2).
6. potable weak and soft layer band in-situ direct shear test instrument according to claim 1, it is characterized in that, potable weak and soft layer band in-situ direct shear test instrument also comprises the sensor (23) for measuring dividing plate (8) and shear box (2) displacement, and described sensor (23) is connected with computer data acquisition system.
7. potable weak and soft layer band in-situ direct shear test instrument according to claim 1, it is characterized in that, described counter-force steelframe (1) is four post two-plate counter-force steelframes, the top cover of described four post two-plate counter-force steelframes is welded with girt strip (11), the both sides corresponding with described horizontal addload system (3) of described four post two-plate counter-force steelframes are steel plate, and all the other both sides of described four post two-plate counter-force steelframes are in open state.
8. potable weak and soft layer band in-situ direct shear test instrument according to claim 7, it is characterized in that, described counter-force steelframe (1) also comprises the counter-force seat for being fixedly connected with rocky ground, and the lower end of each column of described four post two-plate counter-force steelframes is all provided with a described counter-force seat.
9. potable weak and soft layer band in-situ direct shear test instrument according to claim 8, it is characterized in that, described counter-force seat is fixed on described rocky ground by expansion bolt.
10. the method for testing of potable weak and soft layer band in-situ direct shear test instrument as described in claim 1 to 9, is characterized in that, comprising:
Step 1, select to need weak intercalations (12) the exposure position of carrying out test, throw off the top covering rockmass of the described weak intercalations (12) of preset range, be positioned on described weak intercalations (12) by smooth for the cutting ring (9) of described potable weak and soft layer band in-situ direct shear test instrument, then described cutting ring (9) is pressed down to form cylindric sample in situ, and the soil body of described sample in situ periphery is removed, reserved shear test seam, is then enclosed within the outside of described cutting ring (9) by described shear box (2);
Step 2, level is utilized to ensure place level, utilize ruler to measure and adjust the position of described counter-force steelframe (1), described shear box (2) and described vertical loading system (4) are located along the same line, and put into porous-stone and filter paper in described shear box (2);
Step 3, start-up simulation machine data acquisition system also returns to zero, then start described horizontal addload system (3) and vertical loading system (4), and adopt fine motion form alternately to make the workplace of described horizontal addload system (3) and vertical loading system (4) and described shear box (2) be adjacent to;
Step 4, flat stacking is adopted to carry out quick shear test: to apply vertical pressure by described vertical loading system (4), and apply level to shearing force to catch peak value by described horizontal addload system (3) classification, described sample in situ is made to cut damage in 3 to 5min, the loading of described horizontal addload system (3) is stopped after detrusion reaches predetermined value, complete one group of test, and by described computer data acquisition system whole process record stress-strain data;
Step 5, unload described horizontal addload system (3) and described vertical loading system (4) successively, take out described shear box (2), lever up the expansion bolt on the counter-force seat of described counter-force steelframe (1), make described counter-force steelframe (1) loosen described counter-force steelframe (1) to be taken out.
CN201510202693.7A 2015-04-27 2015-04-27 Portable weak-layer in-situ direct-shear tester and testing method thereof Pending CN104807706A (en)

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CN105223088A (en) * 2015-10-27 2016-01-06 水利部交通运输部国家能源局南京水利科学研究院 The comparatively shear test box of real simulation soil and structure interface stress-deformation behavior
CN105675409A (en) * 2016-03-31 2016-06-15 中国电建集团华东勘测设计研究院有限公司 Integrated type rock mass structural surface direct shear apparatus and direct shear test method
CN105806721A (en) * 2016-05-31 2016-07-27 中国地质大学(武汉) Large rock-soil mass in-situ direct shear testing apparatus
CN105865939A (en) * 2016-04-05 2016-08-17 王永洪 Pile-soil interface shearing stress testing method
CN105891018A (en) * 2016-06-30 2016-08-24 四川水利职业技术学院 Rock direct shear testing machine and shear box and testing system thereof
CN105890947A (en) * 2016-04-07 2016-08-24 三峡大学 Device and method for preparation of soil body for site soil body direct shear test and direct shear test
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CN105928791A (en) * 2016-05-04 2016-09-07 三峡大学 Method of in-situ measurement of upper rock mass stress and in-situ direct shear test for weak intercalated layer between rock mass layers
CN105928791B (en) * 2016-05-04 2018-11-30 三峡大学 Rock mass interlayer weak intercalated layer base sample sample field direct shear test method
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CN105910920A (en) * 2016-06-22 2016-08-31 青岛理工大学 Temperature control pile-soil interface direct shear test device
CN105891018A (en) * 2016-06-30 2016-08-24 四川水利职业技术学院 Rock direct shear testing machine and shear box and testing system thereof
CN105973723A (en) * 2016-07-26 2016-09-28 山西省交通科学研究院 Slope soil shear strength site test device and method
CN108279155B (en) * 2018-01-29 2020-10-02 东北大学 Multidirectional loading structural surface strength measuring device and using method
CN108279155A (en) * 2018-01-29 2018-07-13 东北大学 A kind of multidirectional loading structure surface intensity measurement device and application method
CN109187918A (en) * 2018-08-03 2019-01-11 江南大学 The staight scissors Sample devices and its application method of wetting-drying test
CN109187918B (en) * 2018-08-03 2021-03-16 江南大学 Direct shear sample device for dry-wet cycle test and use method thereof
CN108984961A (en) * 2018-08-15 2018-12-11 江南大学 Shear Strength Calculation method of the dust collector box body column under lateral load effect
CN108760510A (en) * 2018-08-24 2018-11-06 郑州大学 A kind of concrete biaxial strength meter and measurement method
CN112378784A (en) * 2021-01-15 2021-02-19 西南交通大学 Portable soil body in-situ shear test device and test method thereof

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